If you chop corn at all, spring for something with a kernel processor. It will make a big difference in what your livestock get out of the corn. No cob sorting, no whole kernels in the manure.
We went from Fox (some 3000s and a Max II self propelled) to Gehl 1285. Contrary to what others have said, at least on the newer choppers, EVERYTHING has been available, and my local dealer has nearly everything in stock. If not, they UPS it to me, and I have it next day- niether Deere nor NH will do that for me. Next day service on non-stock items from them is VERY expensive.